Nonlinear Parametric Resonance in the Simplest Model of a Solar Dynamo

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Resumo

The properties of nonlinear parametric resonance are investigated using the example of the low-mode Parker dynamo model. This model is a system of four ordinary differential equations and in the simplest approximation describes the processes of generation and oscillation of large-scale magnetic fields in stellar systems. In the absence of nonlinear effects, the problem under consideration, by analogy with a system of harmonic oscillations, admits an asymptotic division of multiple resonant frequencies. However, despite the fact that at first glance at these frequencies it is reasonable to expect an amplification of the amplitude in the nonlinear case, it is demonstrated that in the presence of nonlinear terms, the behavior of the system is significantly more complex. In particular, generation suppression can be observed at resonant or low frequencies, while amplification occurs in the immediate vicinity of the resonance or at sufficiently high frequencies. The reasons are discussed for this behavior, as well as the possibility of the influence of parametric resonance on the establishment of planetary dynamo cycles.

Sobre autores

A. Serenkova

Physics Faculty, Lomonosov Moscow State University

Email: serenkova.ai19@physics.msu.ru
119991, Moscow, Russia

D. Sokolov

Physics Faculty, Lomonosov Moscow State Universityж Moscow Center of Fundamental and Applied Mathematics

Email: serenkova.ai19@physics.msu.ru
119991, Moscow, Russia; 119991, Moscow, Russia

E. Yushkov

Physics Faculty, Lomonosov Moscow State University; Moscow Center of Fundamental and Applied Mathematics; Space Research Institute

Autor responsável pela correspondência
Email: yushkov.msu@mail.ru
119991, Moscow, Russia; 119991, Moscow, Russia; 117997, Moscow, Russia

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Declaração de direitos autorais © Russian Academy of Sciences, 2023

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